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	Prove that cos2x = cos^2x-sin^2x = 2cos^2x-1 = 1-2sin^2x = (1-tan^2x)/(1+tan^2x). (Baap of Mathematics) View
	Verify (cot^2(x)-1)/(1+cot^2(x))=1-2sin^2(x) (Citrus College STEM Center) View
	prove that: cos2x=cos^2(x)-sin^2(x)=[1-tan^2(x)]/[1+tan^2(x)]=1-2sin^2(x)=2cos^2(x)-1 \|\| #cos(2A) (Seekho aur sikhao) View
	Proof of cos2x=(cosx)^2-(sinx)^2=2(cosx)^2 1=1-2(sinx)^2 (Mathbyfives) View
	Prove that 1+cosx=2cos^2(x/2) and 1-cosx=2sin^2(x/2) trigonometric identites (Seekho aur sikhao) View
	Verify Trig Identity (2cos^2 x -1)^2/(cos^4 x - sin^4 x) = 1 - 2 sin^2 x. Difference of Squares (Ms Shaws Math Class) View
	Proof: sin^2 + cos^2 = 1 (Kyle Kabasares) View
	COS 2A = COS^2 A - SIN^2 A = 1- 2 SIN^2 A = 2COS^2 A -1 = (1 - TAN^2 A) / (1+TAN^2 A) \| TRIGONOMETRY (BR MATHS CLASS) View
	1-cos2x=2sin^2x and 1+cos2x=2cos^2x trigonometry solve (Seekho aur sikhao) View
	show that (i) sin-1(2x√(1-x^2))=2sin-1 x and (ii) sin-1(2x√(1-x^2))=2cos-1 x (Seekho aur sikhao) View